thanks matt (and again thanks Chris)
Perhaps its OCD or something worse, but having so many different answers, I could not help myself and stopped at a different dealer (other than the one that said a calibration was required) and talked with the service manager regarding windshield calibrations for my vehicle for peace of mind....
He stated that GM did in-fact release a TSB recommending calibrations be performed on ALL windshield replacements, HOWVER, if the installer were to (road) test the vehicle after the replacement and found the ADAS (Advance Driver Assistance Systems) to operating properly, then no calibration would be necessary.
He said that with my vehicle, it would likely be OK, but if I felt the LDW was not responding correctly (miss-aligned), to bring it in and he could calibrate if for $125-$150 (don't recall exactly).